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| 型号： | LT3435IFE#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 17/24页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 3A 16TSSOP |
| 标准包装： | 95 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.25 V ~ 54 V |
| 输入电压： | 3.3 V ~ 60 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 500kHz |
| 电流 - 输出： | 3A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 16-TSSOP-EP |
LT3435
APPLICATIO S I FOR ATIO
output voltage is less than 3.3V it is recommended that an
alternate boost supply is used. The boost diode can be
connected to the input (Figure 7b) but care must be taken
to prevent the boost voltage (V BOOST = V IN ? 2) from
exceeding the BOOST pin absolute maximum rating. The
additional voltage across the switch driver also increases
power loss and reduces efficiency. If available, an inde-
pendent supply can be used to generate the required
BOOST voltage (Figure 7c). Tying BOOST to V IN or an
independent supply may reduce efficiency but it will re-
duce the minimum V IN required to start-up with light
loads. If the generated BOOST voltage dissipates too
much power at maximum load, the BOOST voltage the
LT3435 sees can be reduced by placing a Zener diode in
series with the BOOST diode (Figure 7a option).
OPTIONAL
A 0.33 μ F boost capacitor is recommended for most appli-
cations. Almost any type of film or ceramic capacitor is
suitable but the ESR should be <1 ? to ensure it can be fully
recharged during the off time of the switch. The capacitor
value is derived from worst-case conditions of 1700ns on
time, TBD boost current and 0.7V discharge ripple. The
boost capacitor value could be reduced under less de-
manding conditions but this will not improve circuit opera-
tion or efficiency. Under low input voltage and low load
conditions a higher value capacitor will reduce discharge
ripple and improve start-up operation.
SHUTDOWN FUNCTION AND UNDERVOLTAGE
LOCKOUT
The SHDN pin on the LT3435 controls the operation of the
IC. When the voltage on the SHDN pin is below the 1.2V
shutdown threshold the LT3435 is placed in a “zero”
supply current state. Driving the SHDN pin above the
V IN
V IN BOOST
LT3435
GND
SW
V OUT
shutdown threshold enables normal operation. The SHDN
pin has an internal sink current of 3 μ A.
In addition to the shutdown feature, the LT3435 has an
V BOOST – V SW = V OUT
V BOOST(MAX) = V IN + V OUT
(7a)
undervoltage lockout function. When the input voltage is
below 2.4V, switching will be disabled. The undervoltage
lockout threshold doesn’t have any hysteresis and is
mainly used to insure that all internal voltages are at the
V UVLO = R 1 ? SHDN + + I SHDN ? + V SHDN
V OUT ( R 1 )
V IN
V IN
V IN BOOST
LT3435
GND SW
V BOOST – V SW = V IN
V BOOST(MAX) = 2V IN
(7b)
V IN BOOST
LT3435
GND SW
V BOOST – V SW = V DC
V BOOST(MAX) = V DC + V IN
D SS
V OUT
V DC
V OUT
3435 F07
correct level before switching is enabled. If an undervolt-
age lockout function with hysteresis is needed to limit
input current at low V IN to V OUT ratios refer to Figure 8 and
the following:
? V V SHDN ?
? R 3 R 2 ?
V HYST =
R 3
R1 should be chosen to minimize quiescent current during
normal operation by the following equation:
( 1 . 5 )( I SHDN ( MAX ) )
(7c)
Figure 7. BOOST Pin Configurations
R 1 =
V IN – 2 V
3435fa
17
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| LT3436 | 制造商:LINER 制造商全称:Linear Technology 功能描述:3A, 800kHz Step-Up Switching Regulator |
| LT3436EFE | 功能描述:IC REG BOOST ADJ 3A 16TSSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LT3436EFE#PBF | 功能描述:IC REG BOOST ADJ 3A 16TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:250 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V 输入电压:2.05 V ~ 6 V PWM 型:电压模式 频率 - 开关:2MHz 电流 - 输出:500mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:6-UFDFN 包装:带卷 (TR) 供应商设备封装:6-SON（1.45x1） 产品目录页面:1032 (CN2011-ZH PDF) 其它名称:296-25628-2 |
| LT3436EFE#TR | 功能描述:IC REG BOOST ADJ 3A 16TSSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LT3436EFE#TRPBF | 功能描述:IC REG BOOST ADJ 3A 16TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
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